/*
 * Copyright � 2010-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Collections;
using NUnit.Framework;
using Spring.Context.Support;
using Spring.Example.Scannable;
using Spring.Objects.Factory;
using Spring.Objects.Factory.Xml;

namespace Spring.Context.Attributes;

public class SimpleScanTests
{
    private IApplicationContext _applicationContext;

    [SetUp]
    public void Setup()
    {
        _applicationContext = new XmlApplicationContext(ReadOnlyXmlTestResource.GetFilePath("SimpleScanTest.xml", GetType()));
    }

    //[Test]
    public void FooService()
    {
        IFooService fooService = GetObject<IFooService>();
    }

    public T GetObject<T>()
    {
        return (T) DoGetInstance(typeof(T), null);
    }

    public T GetObject<T>(string name)
    {
        return (T) DoGetInstance(typeof(T), name);
    }

    protected object DoGetInstance(Type serviceType, string key)
    {
        if (key == null)
        {
            IEnumerator it = DoGetAllInstances(serviceType).GetEnumerator();
            if (it.MoveNext())
            {
                return it.Current;
            }

            throw new ObjectCreationException(string.Format("no services of type '{0}' defined", serviceType.FullName));
        }

        return _applicationContext.GetObject(key, serviceType);
    }

    /// <summary>
    /// Resolves service instances by type.
    /// </summary>
    /// <param name="serviceType">Type of service requested.</param>
    /// <returns>
    /// Sequence of service instance objects matching the <paramref name="serviceType"/>.
    /// </returns>
    protected IEnumerable<object> DoGetAllInstances(Type serviceType)
    {
        foreach (string objectName in _applicationContext.GetObjectNamesForType(serviceType))
        {
            yield return _applicationContext.GetObject(objectName);
        }
    }
}
